High-performance racing spark plug featuring a fine-wire 1.3mm nickel alloy center electrode, engineered to withstand extreme racing conditions while offering improved ignitability over a conventional standard plug. Built with a solid 98% pure copper core for enhanced heat dissipation, trivalent metal plating for superior anti-corrosion and anti-seizing properties, a built-in resistor, a non-projected tip design tailored for high-output applications, and a solid terminal configuration explicitly designed to resist vibration loosening.
Specs & Details
- Stock Number: 4015
- Part Number: BR9EG (Solid)
- Thread Size: M14 - 1.25
- Reach: 19.0 mm (0.750 in)
- Seat Style: Gasket (Flat)
- Heat Range: 9
- Resistor Type: Resistor (5,000 Ohms)
- Terminal Type: Solid Terminal (Non-Removable Nut)
- Electrode Material: Fine-wire (1.3mm) nickel alloy center electrode (Copper core)
Two-Stroke Vehicle Fitment
| Make | Model | Engine Type | Year Range |
| Yamaha | YZ 125 | Two-Stroke Motocross | 1992–2004 (Select Years) |
| Honda | CR 125R | Two-Stroke Motocross | 1999–2007 |
| Various | High-Performance Race Karts / Shifter Karts | Two-Stroke Competition | Select Years |
| Husqvarna / TM | 125cc Competition Models | Two-Stroke Motocross / Enduro | Select Years |
TSO Garage Note: A cold heat range (9) fine-wire nickel racing plug with a solid terminal nut. This is the exact solid-terminal equivalent to stock #3230 (the standard BR9EG). It is an ideal choice for high-revving 125cc two-stroke motocross engines and high-vibration race kart applications where a colder heat range is required to manage severe thermal stress, and where a solid terminal post prevents ignition caps from vibrating loose under aggressive racing frequencies.
Compatibility
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